I cleaned it up as well as I could, replaced the cap and so far so good.
Quality cap, but that didn't stop it from failing.

bifo78 wrote:I have a broken SC-55, the battery appeared fine but I went ahead and replaced it anyway since I have plenty around, but I discovered that someone must have plugged the wrong power supply into it at some point because a resistor right on the power input was snapped clean in half. I don't have nearly enough faith in my ability to replace it, is there an inexpensive repair service/person who can fix it for me on here? My local guys would charge me more than it's worth to just buy a new one and otherwise it appears to be in perfect shape.
Silanda wrote:Saw this thread yesterday and decided to check out my SC-155. Sure enough, the battery had started to leak slightly so I replaced it with a spare. No sign of corrosion that I can see on the holder.
To be honest, I wasn't even aware that CR-2032s did leak. It's a blessed relief that Roland, unlike Yamaha I believe, installed their batteries in a holder rather than using solder tabbed ones. That helps to protect the board and makes them a damn sight easier to change.
bjwil1991 wrote:I have an SC-55 MKI myself (not GM, only GS), and unfortunately, it never holds notes when playing a specific MIDI file, such as the original RuneScape opening theme.
I replaced the battery since it was on its last legs, tried cleaning the MIDI ports for any success, and no success to fix the note issues. Finding the MKII version is hard these days (about $150 or more on eBay).
m5215tx wrote:I just did and found a battery that was about to leak on the main board! Unfortunately, the battery is soldered on the main board so I can't easily replace it so I just carefully removed it. No big deal though as I will only be using my TG300 for games that support general MIDI and listening to other MIDI music so I prefer it out so I don't have to worry about possible battery leaks.
thierry wrote:Try to open the sc 155 without luck, someone knows how to open it, remove all the screws and it is seen that it is stuck
thanks!